1. 丛枝菌根真菌联合拮抗菌对花椒根腐病的防治作用.
- Author
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李梦玮, 陈晓霞, 廖礼彬, 李婧怡, 张楠楠, and 石福孙
- Subjects
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VESICULAR-arbuscular mycorrhizas , *ROOT rots , *BACILLUS subtilis , *PENICILLIUM , *ZANTHOXYLUM - Abstract
【Objective】The study aimed to explore the biological control effect of arbuscular mycorrhizal fungi combined with antagonistic microorganisms on Zanthoxylum bungeanum root rot, and provide theoretical basis for solving the problem of Z. bungeanum root rot.【Method】In this study, arbuscular mycorrhizal (AM) fungi(Rhizophagus irregularis), Penicillium oxalicum HB21-1, and Bacillus subtilis HX11 were inoculated separately or in combination to conduct pot experiments on the control effect of Z. bungeanum root rot, in order to evaluate the control effect of different combinations of treatments, and the infection rate of AM fungi was measured by staining microscopy. Then, the activities of defense enzymes in the root and soil of Z. bungeanum were measured to explore the biological control mechanism.【Result】The incidence rate of Z. bungeanum root rot under the single treatment of pathogenic bacteria was 86.67%, and the incidence rate of root rot under the combined treatment of AM fungi+HB21-1+HX11 was the lowest, 13.33%, and the control effect was 78.89%, followed by the treatment of HB21-1+HX11, AM fungi+HB21-1, and the control effect was 62.78% and 57.12%, respectively. The highest infection rate of AM fungi was 52.22% under the treatment of AM fungi+HB21-1+HX11, while the lowest infection rate was 24.89% under the treatment of AM fungi alone. At 60 d, the SOD and PAL enzyme activities in the roots of Z. bungeanum were the highest under the treatment of AM fungi+HX11, and the POD enzyme activity in the roots of Z. bungeanum was the highest under the treatment of AM fungi+HB21-1. The plant defense enzyme activity showed an upward trend over time. AM fungi and HX11 could significantly increase soil acid phosphatase and urease activities over time, while HB21-1 could significantly increase soil sucrase activity.【Conclusion】The combination of AM fungi+HB21-1+HX11 has a good disease prevention effect on Z. bungeanum root rot, and the combination of these strains resulted in the highest infection rate of AM fungi. Over time, the POD, SOD and PAL enzyme activities in the roots of Z. bungeanum and the soil acid phosphatase and urease activities under the treatment of AM fungi and antagonistic bacteria showed an upward trend. The soil sucrase activity slightly decreased, but all were higher than the pathogen treatment group, indicating that AM fungi, HB21-1 and HX11 can induce varying degrees of increase in plant defense enzyme activity and soil enzyme activity, which has the potential for biological control applications. [ABSTRACT FROM AUTHOR]
- Published
- 2023
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